/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/Collision/CollisionPruning.h
Utility to attempt to remove sub-surface contacts on a particle when those edge contacts are "hidden" by other contacts This is not 100% effective and may occasionally remove contacts that it shouldn't! Ideally you would just use this pruning policy in specific locations in the world where sub-surface contacts are a problem.
class FParticleSubSurfaceCollisionPruner